Electric drill



(No-Model.) Q 3 SheetsShe et 1.

' M. HEBGEN.

ELECTRIC DRILL.

No. 556,502. PatentedMarQlV, 1896.

INVENTOR BY g 2 ATT HNEYS H WITNESSES: 0 62M;

3 -Sheet s--Sheet 3.

M. HEBGEN.

. ELECTRIC DRILL.

No. 556,502. Patented Mar.'17,189 6.

WITNESSES: INVENTOH z 7 MM QM M 'I BY wok n-M1:- m

. A77 fiNEY UNITED STATES PATENT OFFICE.

MAX IIEBGEN, OF BUTTE, ASSIGNOR OF ONEJIALF TO II. WI TURNER, OF SILVER BOIV, MONTANA.

ELECTRIC DRILL.

SPECIFICATION forming part of Letters Patent No. 556,502, dated March 17, 1896.

Application filed July 16, 1895. Serial No. 556,161. (No model.)

To 00% whom it may concern.-

Be it known that 1, MAX HEBGEN, a citizen of the United States, residing at Butte, in

the county of Silver Bow and State of Montana, have invented certain new and useful Improvements in Electric Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in mining and excavating machinery; and it has for its main object to provide an electrically-actuated drill-machine which will be so compact in its construction that it can be moved from place to place in the mine or drift and readily adjusted to the proper position so that the drill may be fed forward to accomplish its work as hereinafter more full set forth. I

A further object of my invention is to so construct the engine or drill-operating mechanism that its parts will be thoroughly protected from the dust and falling dbris occasioned by the blasting necessary to loosen the rocks and earth in mines and underground excavations, and also to protect the mechanism from the dampness or moisture usually incident to mines and excavations.

My invention further consists in certain details of construction and arrangement of parts hereinafter more specifically described in the specification, illustrated in the drawings and pointed out in the claims.

In the accompanying drawings, Figure 1 represents a view partly in section and partly in side elevation of the machine complete. Fig. 2 is a top plan view of the counter-shaft and its gearing. Fig. 3 is a side elevation of the engine or motor complete, showing it in position to be operated. Fig. 4 is a vertical sectional view taken on the line a: w of Fig. 1. Fig. 5 is a vertical section on the line 3 y, Fig. 1, of the counter-shaft. Fig. 6 is a transverse vertical sectional view taken on the line 2 z of Fig. 3. Fig. 7 is a longitudinal view through the clamp mechanism, showing a portion of the drill-tube. Fig. Sis a detached longitudinal sectional view of aport-ion of the clutch mechanism 5 Fig. 9, a similar view of an intergearing part of the same; and Fig.

10, a longitudinal sectional view of the sleeve, being the clutch mechanism surrounding the counter-shaft.

Referring more particularly to the drawings, the numeral 1 indicates an electric motor, consisting of a cylindrical casing of soft iron mounted upon a suitable base 2. The said casing constitutes the field-magnet of the motor and on its interior is provided with four shunt-wound poles, between the ends of which the rotating armature 3 is arranged to rotate in the usual manner.

The armature is mounted on a hollow shaft 4, through which extends the drill-shaft 5. The drill shaft is capable of longitudinal movement in the hollow armature-shaft so that it may be fed forward to advance the drill, and be retracted, as more fully hereinafter set forth.

The forward end of the hollow drill-operating shaft is externally screw-threaded, as indicated by numeral 6, and passes loosely through a sleeve and collar 7, which is secured to the center of the front head 8 of the motor, as shown in Fig. 1 of the drawings.

The numeral 9 indicates a cog gear-wheel, the hub of which is internally screw-threaded and fits over the externally-screw-threaded projecting end of the drill-driving shaft. The said hub is provided with an internally an-, nularly-recessed cap 10, which is secured thereto by means of bolts 11. The sleeve 7, before mention ed, is provided with a hardened steel collar 12, having a grooved bearing-face on one side, and the interior of the cap 10, before mentioned, has a similarly-grooved face. Between the grooved faces of the two are located antifriction-balls 13, which permit the wheel to rotate with a minimum of friction.

The numeral 14 indicates a gear-wheel located on the outer or forward end of the counter-shaft 15. It is designed to intermesh with gear-wheel 9. This gear-wheel 14 is keyed to the counter-shaft, which has bearings in a hanger 16, depending from the forward head of the motor and in a frame 17 upon the base of the same, as shown in Figs.

1 and 2 of the drawings.

The counter-shaft at its rear end has fixed 10o upon it a cog gear-wheel 18 recessed at one side, as shown, that portion of the rim of said wheel forming the recess being beveled, as shown in Fig. 1 of the drawings. Within the said beveled recess sits a clutch-wheel 19 having its periphery beveled to correspond to the bore of the recess. The said wheel is mounted on the rear end of a sleeve 20, which is fitted upon the co unter-shaft and is capable of a longitudinal movement thereon.

The feed of the drill may be regulated by the rheostat, but it is also controlled by the following means: It will be observed that the clutching engagement by which the gear 18 is caused to rotate in unison with the counter shaft is effected and normally maintained by the pressure of the coiled spring 24. The engagement is made, preferably, by an ordinary clutch of the friction-type and the tension of the spring 21 will, under all ordinary conditions, efiect a positive engagement of the gear 18 with the counter-shaft, so that the feed of the drill-operating shaft will be constant and positive unless arrested at the will of the operator. The lever 27 is provided for this purpose, since by moving said lever in one direction the tension of the spring 24 may be either diminished or wholly overcome to lessen or terminate the frictional engagement of the clutch. By moving said lever in the opposite direction the cluteh may be forced into closer engagement with the gear 18 if circumstances render it necessary.

lVhen the clutch is entirely disconnected, it may be desirable to cause an immediate cessation of rotation of the counter shaft, which might otherwise be carried by its mementum far enough to feed the drill beyond the point desired. This is especially desirable when the cutting-points of the drill encounter minerals which may injure or detach them. For this purpose I provide the friction-disk 20, which is loosely sleeved upon the sleeve 20, its hub being arranged in a clamp 20, which forms partof the frame 17, as seen in Fig. 4. The two parts of the clamp are connected by a bolt 20, and by turning up a nut on said bolt the disk 20 may be rigidly held at such distance from the loose gear 18 that when the clutch is withdrawn from the gear its face will be brought against the face of the friction-disk with any required pressure, the lever 27 enabling such force to be applied that the counter-shaft may be arrested instantaneously or practically so. The lever 27 is thus capable of use for a double purposeviz., to terminate the clutch engagement and arrest the countershaft through the agency of the friction-disk, or to modify the force of the spring by which the clutching engagement is made and maintained. In the latter respect the lever may be used to reinforce the spring and drive the clutch into closer engagement, or it may be used to lessen the spring-pressure and thus permit a slip of the clutch within the loose gear 18, whereby the feed will be automatically arrested should any unusual obstruction be encountered.

The sleeve 20 is provided atits forward end with a flange 21. This flange sits in an annular recess in a flange 22 at the rear end of a sleeve 23, which is also fitted on the counter-shaft and is capable of longitudinal movement thereon, being pressed normally backward by means of a spiral spring 24, which surrounds the counter-shaft 15. This sleeve is provided with a stud 25, at one side to which is pivoted one end of a lever 26 fulerumed at 27 to the frame 17 for the purpose hereinbefore explained.

The numeral 28 indicates a cog gear-wheel having its hub internally screw-threaded and screwed upon the rear end of the hollow armature-shaft so as to be carried with said shaft when the armature is rotated. The said gearwheel intergears with wheel 18, loosely mounted on the counter-shaft so as to communicate a rotary motion to the counter-shaf t when required to operate the drill.

The hollow drill-driving shaft 5, before mentioned, extends to the rear of the motor or engine, as shown in Fig. 3, and is grooved longitudinally, as indicated by numeral 29, Fig. 1, to receive a feather 30 between it and the interior face of the hub of the gear-wheel 28, which fits over it and which causes the gear-wheel to rotate with the shaft 5, and at the same time permit its longitudinal movement as the drill is fed forward.

Through the hollow drill-carrying rod 5 extends the hollow drill-rod 31. The said rod is made in sections which are provided with threaded joints adapted to be screwed together. The rear end of shaft 5 is externally screw-threaded and has secured to it an internally-screw-threaded sleeve 32, which has a slotted head at its rear end, the slots being provided with clamping-blocks 33, having their contiguous faces semicircularly recessed and corrugated in order to clamp the drillrod which passes between the blocks. The blocks are forced to grasp the drill-rod by means of suitable set-screws 34, as shown in Figs. 6 and 7 The numeral 35 indicates a flexible hose which is secured to a suitable water supply at one end and to the rear end of the drillrod at the other to provide for the circulation of water through the drill-bit to prevent it from heating as well as to wash away the bor- 1n gs.

The base of the engine or motor is provided with a circular recess 36, which is swiveled on a short journal at the top of a divide-block 37 which latter is also swiveled on a vertical journal 38 extending upward from a block 39. This construction permits the engine or metor to be adjusted both vertically and horizontally to its work. The block 35) is mounted upon jack-screws 40, stepped at their lower ends in hearings in the shoes 41. These screws have openings .in their heads for the insertion of hand-spikes, by which they may be turned. The screws permit the engine or motor to be adjusted vertically to its work.

I have represented my motor as mounted upon a column supported by jack-screws; but it may be supported by a tripod or in any suitable manner without departing from the spirit of my invention.

The numeral 42 indicates a rheostat connected with a suitable electric generator by means of conductors 43, and 44 indicates conductors leading from the rheostat to the motor, with which they are connected in the usual manner.

The drill used in connection with my improved engine or motor is made in the form of a hollow tube, having its cutting-edge faced with carbons, as is usual with diamondfaced rock-drills.

The operation of my device is as follows: The engine or motor being suitably adjusted in the mine or drift, with the drill and other parts in proper position, the motor is started, the clutch-wheel on the counter-shaft being forced into the loose cog-wheel on the said shaft, so as to carry the shaft with it. Motion is transmitted from the wheel 28 on the hollow armature-shaft to the wheel 18 on counter-shaft 15 and wheel 14 on its opposite end, and from said wheel 14 to intergearing wheel 9. The said wheel 9 being loosely mounted causes the screw-threaded portion of the shaft to be fed forward to feed the drill, which is rotated by the hollow drill-rod, which receives its rotary motion from shaft 5, as hereinbefore explained. Then the drill has entered the rock to its limit the drill-rod is disengaged therefrom, the clamp at the rear end of the shaft 5 is loosened, and another section of drill-rod added. The clamp is then readjusted and the drilling proceeded with. This operation is repeated until the drill has been advanced to the proper depth.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In an electrically-operated rock-drill, the combination with a continuous, soft-iron casin g having interior pole-pieces of a hollow armature-shaft having an armature adapted to rotate within and be wholly inclosed by said casing which constitutes the field-magnet of the electric motor, a drill-operating shaft longitudinally movable in and adapted to rotate with the hollow armature-shaft, a spur-gear loosely mounted on the forward end of the motor and having an interiorly-threaded hub meshing with an external thread upon the drill-operatin g shaft, a counter-shaft arranged in bearings beneath the casing and geared to the said spur-gear, a gear loose upon the rearward part of the counter-shaft, an intermeshing gear fixed on the armature-shaft, a springpressed clutch sleeved on the counter-shaft and manually operated, means for throwing said clutch against the pressure of said spring, thereby disengaging the clutch, substantially as specified.

2. In an electrically-operated rock-drill, the combination with a continuous casing constituting the field-magnet of the electric motor, of an armature and hollow armature-shaft adapted to revolve within and be wholly inclosed by said casing, a hollow, drill-operating shaft arranged to rotate with and move longitudinally in the hollow armature-shaft, a feed-gear having a loose, antifriction-bearing upon the forward end of the motor-casing, its threaded hub meshing with a threaded portion of the drill-operating shaft, a countershaft, a fixed gear thereon meshing with the feeding-gear, a gear loose on said countershaft and meshing with a gear fixed upon the hollow armature-shaft, a clutch carried by a sleeve on said counter-shaft, a spring coiled on said shaft to make and preserve the clutch engagement, manually-operated means for withdrawing the clutch from engagement, and a suitable friction device against which the face of the clutch is brought when withdrawn, to arrest the counter-shaft, substantially as specified.

3. In an electrically-operated rock-drill, the combination with a hollow armature and shaft, of a water-tight casing which constitutes the field-magnet of the motor, a hollow drill-operating shaft to rotate with and move longitudinally in the hollow armature-shaft, positive mechanism for feeding the hollow drill-operating shaft, and a manually-operated lever for interrupting and controlling the feed movement, substantially as specified.

4. In an electrically-operated rock-drill, the combination with a hollow armature-shaft of a water-tight casing constituting the fieldmagnet of the motor, a hollow drill-operating shaft made in sections and arranged to rotate with, and move longitudinally within said armature-shaft, a feed-gear loosely mounted on the forward end of the casing, its threaded hub meshing with a thread on the drill-operating shaft, a counter-shaft geared to said feed-gear, a loose gear on the counter-shaft meshing with a fixed gear on the armatureshaft at the rear of the casing, a springpressed friction-clutch on the counter-shaft to engage the loose gear, and a manually-operated lever fulcrumed on the frame and connected to a stud on the sleeve of the clutch to overcome, or modify the spring-pressure which maintains the clutching engagement, substantially as specified.

5. In an electrically-operated rock-drill, the combination with an armature and hollow armature-shaft, of a water-tight casing which constitutes the field-magnet of the armature, a hollow drill-operating shaft rotating with and movable within the armature-shaft longitudinally, a recessed cap inclosing a flange on the forward end of the casing, a series of antifriction-balls arranged between the flange and cap, a feed-gear attached to said cap by bolts, its threaded hub engaging the externallythreaded drill-shaft, a counter-shaft supported in a bearing hanging from the casing and in a frame thereon, a fixed gear meshing with the feed-gear, a cupped gear loose on the counter-shaft, a fixed gear on the armatureshaft meshing with the loose gear, a clutch movable at the counter-shaft to lock the cupped gear therewith, a spring normally making and maintaining sueh clutch engagement, a friction-disk having a hub Within which the sleeve of the clutch moves, means for clamping the hub in position so that it shall be engaged by the outer face of the clutch when the latter is disengaged, and a lever for IO operating said clutch, substantially as specifled.

In testimony whereof I have afl'ixed in y signature in presence of two Witnesses.

MAX HEBGEN. lVitnesses:

II. XV. TURNER, E. M. CRUMRINE. 

